scholarly journals Groundwater Seepage and Source Head Collapse Mechanism of Debris flow in heavy Rain using Finite Element Method and Full Scale Failure Experiment

2020 ◽  
Vol 15 (2) ◽  
pp. 355-369
Author(s):  
Aki MATSUMOTO ◽  
Yoshihumi KOCHI ◽  
Motoyuki SUZUKI ◽  
Masayuki HYODO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Debris Flow ◽  
Heavy Rain ◽  
Full Scale ◽  
Collapse Mechanism ◽  
Groundwater Seepage ◽  
Scale Failure ◽  
Element Method

Analysis of Solid T-Pier Dynamic Response to Debris Flow

2015 ◽  
Vol 744-746 ◽  
pp. 739-743
Author(s):  
Zhen Yu Xiu ◽  
Ming Jie Zhang ◽  
Chen Zhang ◽  
Yu Hong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Debris Flow ◽  
Stress And Strain ◽  
Impact Action ◽  
The Impact ◽  
Element Method

In recent years, traffic lines are rapidly thrusting into the hilly regions[1]. It’s not hard to list such cases that bridges have been damaged by mud-rock flow. In this paper, it is studied that the dynamic response of the solid T-pier to mud-rock flow. a finite element method is applied to analyse the effects of the stress and strain of an T-pier under the impact action of mud-rock flow with different velocity.

Stability Analysis of Underground Caverns by Jointed Finite Element Method

2012 ◽  
Vol 238 ◽  
pp. 814-817 ◽  
Author(s):  
Ji Chang Wu ◽  
Yu Min Zhang ◽  
Hong Xia Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Fractured Rock ◽  
Deformation Characteristic ◽  
Collapse Mechanism ◽  
Fractured Rock Mass ◽  
Underground Caverns ◽  
Water Collection ◽  
Element Method

The jointed finite element method (JFEM) is used to analyze the deformation and failure characteristic of fractured rock mass and anchor reinforcement effect for the water collection shaft of the main power house of Dagangshan Hydropower Station. The results show that the JFEM not only simulates the actual rock mass structure very well, but also gives the reasonable simulation results for the common unstable rock mass. The JFEM may accurately simulate the major deformation characteristic and collapse mechanism, which is another effective way to analyze the stability of fractured rock mass. The on-site monitoring results show that the anchor reinforcement is effective for the water collection shaft

A Coupled Discrete–Finite Element Method for the Ice-Induced Vibrations of a Conical Jacket Platform with a GPU-Based Parallel Algorithm

2019 ◽  
Vol 17 (04) ◽  
pp. 1850147 ◽  
Author(s):  
Shunying Ji ◽  
Shuailin Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Parallel Algorithm ◽  
Beam Element ◽  
Full Scale ◽  
Bond Breaking ◽  
Ice Loads ◽  
Spherical Elements ◽  
Scale Data ◽  
Element Method

Flowing ice draws special attention due to the dynamic response of jacket platforms. In this study, a coupled discrete element method (DEM) and finite element method (FEM) are developed to analyze the interaction between sea ice and conical jacket platforms to determine the ice-induced vibrations (IIVs) of the structure. To model the ice cover and to investigate ice loads, a DEM with bond-breaking spherical elements is adopted. Meanwhile, the FEM (with a beam element) is applied to model the IIVs of the jacket platform. An efficient transmission scheme between the bond-breaking spherical elements and the beam element is proposed. The graphics processing unit-based parallel algorithm is developed to improve the computational efficiency. The simulated ice loads are verified by comparing them with the full-scale data and different ice load functions. The simulated IIV accelerations of the JZ20-2 MUQ conical platform in the Bohai Sea (China) are consistent with the full-scale data under various ice conditions (e.g., velocity and thickness). The numerical results show that the IIV acceleration increases linearly with the ice velocity and the square of the ice thickness.

Kinematic Limit Analysis of Nonassociated Perfectly Plastic Material by the Bipotential Approach and Finite Element Method

2010 ◽  
Vol 77 (3) ◽  
Author(s):  
Ali Chaaba ◽  
Lahbib Bousshine ◽  
Gery De Saxce
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Velocity Field ◽  
Stress Field ◽  
Limit Analysis ◽  
Plastic Material ◽  
Collapse Mechanism ◽  
Perfectly Plastic ◽  
Kinematic Approach ◽  
Element Method

Limit analysis is one of the most fundamental methods of plasticity. For the nonstandard model, the concept of the bipotential, representing the dissipated plastic power, allowed us to extend limit analysis theorems to the nonassociated flow rules. In this work, the kinematic approach is used to find the limit load and its corresponding collapse mechanism. Because the bipotential contains in its expression the stress field of the limit state, the kinematic approach is coupled with the static one. For this reason, a solution of kinematic problem is obtained in two steps. In the first one, the stress field is assumed to be constant and a velocity field is computed by the use of the kinematic theorem. Then, the second step consists to compute the stress field by means of constitutive relations keeping the velocity field constant and equal to that of the previous step. A regularization method is used to overcome problems related to the nondifferentiability of the dissipation function. A successive approximation algorithm is used to treat the coupling question. A simple compression-traction of a nonassociated rigid perfectly plastic material and an application of punching by finite element method are presented in the end of the paper.

scholarly journals Finite element method modeling of crankshaft axial impact measurements

2020 ◽  
Vol 53 (2) ◽  
pp. 85-99
Author(s):  
Antti-Jussi Vuotikka ◽  
Marko Jokinen ◽  
Pasi Halla-aho ◽  
Jukka Aho ◽  
Antti Mäntylä ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Full Scale ◽  
Head Region ◽  
Axial Thrust ◽  
Axial Impact ◽  
Explicit Finite Element ◽  
Significant Extension ◽  
Engine Crankshaft ◽  
Element Method

It has been recently discovered that there is a periodical axial impact phenomenon in a running engine crankshaft. Bending of the shaft causes significant extension of the crankshaft and impact to the engine block through the axial thrust bearing. The aim of this work is to study impact-induced energy fluctuations in a complex-shaped Wärtsilä sixteen vee 32 engine crankshaft by using an explicit finite element method (FEM) during the first 25 ms after impact. Using the FEM allows us to study real components used in industry, and analyze their dynamics in the transient phase. In conclusion, we found interesting results that can be used as guidelines for a full-scale crankshaft measurement instrumentation plan. The full-scale measurements will be performed later in the Wärtsilä Oy facility at Vaasa, Finland. The main finding is that a substantive amount of energy is trapped in the head region and the first two crank pins of the crankshaft, which can affect crankshaft durability regarding high-cycle fatigue.

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